Carburetor



May 19, 1931 H. .1. GUIRAUD 1,805,947

CARBURETOR 2 Sheets-Sheet 1 Filed Nov. 12. 1926 IN VEN TOR HENRI ULE GUIRAUD av v 6 Amway May 19, 1931. H. J. GUIRAUD 1,805,947

CARBURETOR Filed NOV- 12, 1926 2 Sheets-Sheet 2 'IIIIIIIIII /NvE/vToR HE/YR/ JULES GU/RA UD Patented May 19,V

UME STATES Least? FRANCE CASEBUEETQE Application mea November 12, 192e, serial Np( i4s`c7sana ink France octobrlia, 192e.

The invention has for its object to provide improvements in carburetor-s for all types of explosion motors but more particularly for low horse power motors such 4as are commonly used upon. motorcycles.

A main feature of the invention consists in the combination of a'piston sliding'tran'sversely to the suction conduit and used to throttle the mixture passage section towards the motor, with a flexible extension tube of the slow speed nozzle as described in pendving application for rpatent Serial No. 40,560

filed by Claudel on June 30, 1925, this piston being suitably notched to cooperate with said flexible extension tube so that the latter, by altering its shape according tothe various positions of the piston, operates'substantially as described in the aforesaid patent application.v v

The annexed drawings show as exemplification one embodiment of the carburetor according to the invention. Fig. 1 Vis a vertical section through the common axis of the emulsion supply nozzle and the suction conduit of the motor. Fig. 2 is a partial sectiony and partial plan view through line lll-H of Fig. 1.r Fig. 3V shows the carburetor in vertical elevation with parts thereof` in' section through line III-III Yof Fig. 2.

Fig. 4 is a side elevation seen from the right` to the left vin regard tovFigs. 1 and 2.

The liquid fuel supplied by the calibrated plug 21 enters the diffusing tube 8, forV normal operation, through channels 4 and 31, and the diffusing tube 7 for slow speed operation7 through channels '4, 28 and 29. p

The emulsion air arrives into both annular chambers around said tubes 7 and 8 by the conduits 32 and 33 shown in dotted lines (Fig. 3) andopening at 34 (Fig. 1),

and enters said tubes through orifices 35 and 36. n

The emulsion madeiny the diffusing tube 8 passes through the main nozzle 12 andv springs out through the orifices 14. The emulsion made in the diffusing tube 7 passes through the slow speed nozzle 15 extending beyond the main nozzle 12 by means 0f a lflexible tube 16. The output of the latter can be regulated by a screw l17 whichr may be hoiiew as descritta ia ai@ pending applision 'supply nozzles. f The mixture supplied to the motor is regulated by a throttling device as described here.-A f after which presents the main feature of the invention.

A piston 45 mounted lfor sliding movement within a cylinder guide 46, is operated by suitable means such as a Bowden cable 47 acting against the pressure of a return spring 48; this piston may thus be'movedv transversely within the conduit 19 soV as to 'throttle more or less'7 as desired, the free passage section for the mixture towards the, motor. In the piston .portion opposite the driving cable Irprovide va slot 49 for the: passage of the flexible extensionr tube 16 of' the slow speed nozzle; the bottom part 50 (Fig. 1) of this slot is longitudinally curved so that in the closed kposition of the throttle the flexible tube due to its elasticity adapts litself within' said curved slot whereby its free end is placed in front of the regulating screw 17. By opening the throttle 45 the tube 16 returns automatically into 'its axial position centrally to the gaseous vein. In-

this manner'y I obtain a simple and "cheap` .K

throttling device in combination with a flex;

ible tube for the supply of lthe slow down emulsion which will operate under allfconditions.

It is well understood that without departing from the scope of the invention theV p throttling device can be adapted topcarburetors of various types different fromthose described; l V f Claims:

1. In a carburetor with a mixing chamber,.

a main nozzle and a slow speed nozzle, inl come binationya flexibletube extending the slowl speed nozzle and parallel in its free position to the axis ofthe mixing chamber of the carburetor and a throttling piston moving in said mixing chambertransversely to they axisv thereof and having an end parallel to said axis of the mixing chamber,v the end of' said.,

piston being provided With a groove of pr'ogressively increasing depth approaching the slow speed nozzle and adapted to receive said flexible tube.

2. In a carburetor With a mixing Chamber7 a main nozzle andy a slow speed nozzle, in combination, a flexible tube extending the slow speed nozzle and parallel in its free position to the axis of the niiXing chamber of the carburetor, a throttling pistony moving in said mixing chamber transversely tothe axis thereof and having an end parallel to said axis of the mixing chamber, the end of said piston being provided with a groove having parallel sides and of progressively increasing depthy approach-ing the slovv speed nozzle', a spring normally inoving said piston intoY closed position and a control device attached to said piston for varying the position thereof against the action of' said spring.

HENRI JULES GUIRAUD. 

